{"instruction": "You are an expert in event extraction. Please extract events from the input that conform to the schema definition. Return an empty list for events that do not exist, and return NAN for arguments that do not exist. If an argument has multiple values, please return a list. Respond in the format of a JSON string.", "schema": [{"event_type": "adverse event", "trigger": true, "arguments": ["Subject.Population", "Treatment.Freq", "Combination.Drug", "Subject.Race", "Treatment.Disorder", "Treatment.Dosage", "Subject.Gender", "Subject.Age", "Treatment", "Treatment.Duration", "Subject", "Effect", "Treatment.Drug", "Treatment.Route", "Subject.Disorder", "Treatment.Time_elapsed"]}, {"event_type": "potential therapeutic event", "trigger": true, "arguments": ["Subject.Age", "Subject.Population", "Treatment.Time_elapsed", "Combination.Drug", "Treatment.Freq", "Treatment", "Treatment.Duration", "Effect", "Subject.Gender", "Subject", "Treatment.Dosage"]}], "input": "A patient with the Wolff-Parkinson-White syndrome presented with incessant orthodromic atrioventricular tachycardia following initiation of procainamide therapy."}
{"adverse event": [{"trigger": "following ", "arguments": {"Subject.Population": "NAN", "Treatment.Freq": "NAN", "Combination.Drug": "NAN", "Subject.Race": "NAN", "Treatment.Disorder": "Wolff-Parkinson-White syndrome", "Treatment.Dosage": "NAN", "Subject.Gender": "NAN", "Subject.Age": "NAN", "Treatment": "initiation of procainamide therapy", "Treatment.Duration": "NAN", "Subject": "A patient with the Wolff-Parkinson-White syndrome", "Effect": "incessant orthodromic atrioventricular tachycardia", "Treatment.Drug": "procainamide", "Treatment.Route": "NAN", "Subject.Disorder": "NAN", "Treatment.Time_elapsed": "NAN"}}], "potential therapeutic event": []}